Research on Preparation of Sponge Bismuth in Chloride Salt System
The effects of free acidity,chloride ion concentration,liquid-solid ratio,and reaction time on the leaching of bismuth from bismuth oxide slag in a chloride salt system were investigated by using sulfuric acid industrial salt system leaching and iron powder displacement.The influence of theoretical amount of iron powder added,reaction time,and reaction temperature on the preparation of sponge bismuth through iron powder displacement of bismuth ions were studied.The experimental results indicated that the optimal conditions for leaching bismuth from bismuth oxide slag were:free acidity of 100 g/L,chloride ion concentration of 90 g/L,liquid-solid ratio of 7:1,and reaction time 2～3 h.The best conditions for the reduction of bismuth ions by iron powder displacement to form sponge bismuth were:iron powder addition amount is 1.2 times the theoretical amount,reaction time is 30 minutes,and reaction temperature is 50℃.Under these conditions,the sponge bismuth content reached 95.1％.
bismuth oxidechloride salt systemiron powderdisplacementsponge bismuth
万方数据
维普
